This series showcases homes so unique they take design to the extreme edge, while introducing the people who build and live in these unusual structures. Tour the most unusual houses found on earth, from a renovated caboose, schoolhouse, bowling alley and gas station to a metal house, "mushroom" house and space-ship house. Host Dale Rivera features homes from North America and other regions of the world, including Asia, Africa, Europe, South America and Australia. (Source: HGTV)